I like my desk to be organized..Do you? I suppose we can "desk" that conversation for another time :) Anyways if you are into being organized then BGP communities (32-bit value) are a great way to tag,organize your routes and make intelligent routing decisions. In this blogtorial I will show you briefly on how to set communities, delete communities (specific one or all of them), and appending to the existing communities.
Here is the topology we will be using.
Entire config can be downloaded here.